Cylinder drying apparatus



(N0 Model) T. s. CRANE. CYLINDER DRYING APPARATUS.

No. 585,378. Patented June 29,1897.

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F. Nonms NrTnn STATES nricn THOMAS S. CRANE, OF EAST ORANGE, NEW JERSEY,ASSIGNOR TO OYRUS O. OURRIER, OF NEWARK, NEW JERSEY.

CYLINDER DRYING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 585,378, dated June 29,1897. Application filed December 2l, 1895.A Serial No. 572,836. (Nomodel.)

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Beit known that I, THOMAS S. CRANE, a citizen of the United States,residing at East Orange, Essex county, New Jersey, have invented certainnew and useful Improvements in a Combined Stirring and Heating Devicefor Drying-Oylinders,fully described and represented in the followingspecification and the accompanying drawings, forming a part of ro thesame.

The object of this invention is to furnish an eective means of securingalarge heatingsurface in the stirring device of a cylinderdrying-machine, with an exceedingly simple I and cheap construction. Toeffect these results, I attach to the rotary shaft of thedrying-cylinder by suitable means a series of longitudinal hollowstirring-blades of peculiar cross-section, such blades being elongatedzo in the direction of their movement, with their broad sides tangentialto the curve of their movement, and the blades being heated by steam, asusual. By this construction the stirring-blades not only agitate thematerial,

z 5 but serve as a series of scoops which are shaped to present anextended surface in the direction of their movement. As the materialslides over this extended surface when the scoops are moved through thesame it 3o is exposed to such heated surface for a much longer time thanwhen a round pipe is moved through the material, as is common in suchgarbage-machines. By forming the blades to scoop up the material andproviding each 3 5 of them in the direction of its motion with anextended surface of heated metal I am enabled to use a very small numberin the drying-cylinder, and thus greatly reduce the expense ofconstruction as well as the power 4o needed to agitate the material.

The invention will be understood by reference to the annexed drawings,in which- Figure l is a cross-section of the stirring devices on line o:cc in Fig. 2, with the adjacent body of the cylinder. Fig. 2 is a sideelevation of the shaft and stirring devices removed from the cylinderwith one of the scoops broken away to exhibit the construction of thehollow arm and the parts being viewed in 5o the direction of the arrow ain Fig. l. Fig. 3

is an end elevation of the drying-cylinder, and Fig. 4 is a longitudinalsection of the cylinder with an elevation of the drying devices insidethe same.

A is the body of the drying-cylinder; B, a steam-jacket formed about thesame in the usual manner; O, the heads, provided with stuffing-boxes D,through which the shaft S is projected, to receive an inlet steam-pipe Eand outlet-pipe F. These pipes are swiveled 6o to the shaft bystufng-boxes e. The shaft just inside the heads is shown formed withsquare collars G G to provide seats for the attachment of the arms l-I,which are formed upon the scoops I. A passage `J extends from theinlet-pipe E to the interior of the collar G, and a passage K extendsfrom the outletpipe to the interior of the collar G. The scoops are madewith steam-chamberz'inside of each, which is connected with the passages7o J and K by holes h, formed through the arms H. 'Ihe scoops are madeof flattened crosssection and'mounted tangentially within the cylinder,so as to easily penetrate the material as they are carried around by theshaft and to present in the direction of their rotation broad surfacesover which the material -is moved by the advance of the scoops. To

effect these objects, the scoops are preferably formed, as shown in thedrawings, of iiattened 8o wedge shape with a sharp corner upon the frontside to readily penetrate the material L, which is shown in Fig. l. Suchform may be readily made of cast-iron, as shown in the drawings, withthe hollow arms H cast in one piece therewith and provided with feet 71,to secure them upon the sides of the square collars by bolts g. Byapplying suitable packing upon theV sides of the square collars thejoints may be made steam-tight, and as there 9o is no direct connectionbetween the passages J and K the steam entering from the pipe E isobviously forced to circulate through the scoops to reach theoutlet-pipe F. Cast-iron is found to be much more durable for use ingarbage-machines, where acid is frequently employed to treat the garbageduring or before the drying operation, and my construction thusfurnishes a means of making the entire structure of such material. Ioo

In Fig. l two of the scoops are shown supported close to the body of thecylinder A, so as to move the material where it lies in the bottom ofthe cylinder, and two other scoops are shown provided with shorter armsII to move them intermediate to the cylinder and the shaft to stir thematerial which lies between such parts. The scoops are preferablyrotated in the direction of the arrow a' in Fig. 1, and it will beobserved by referring to the two scoops which are immersed in thematerial that suoli material is compelled to slide over the broadsurfaces of the scoops, and is thus retained sufficientlyin contact withthe heated metal to dry the material rapidly.

The outer scoops are exposed to the material 'chiefly upon their innersides, but the intermediate scoops are exposed to the material upon boththeir inner and outer sides, and thus exert a powerful influence indrying the same. A portion of the scoops is moved close to the body ofthe cylinder, not only to move the material where it lies in the bottomof the cylinder, where it would otherwise remain motionless, but toscrape off from the shell of the cylinder any material which may stickthereto in drying and which would otherwise form into a solid body andinterfere seriously with the removal of the charge when dried. Suchhollow scoops may be made of boiler-iron or sheet metal and suitablyconnected to the shafts and passages J, but when made of cast-iron inone piece with the arms II they form an exceedingly simpleconstruction,as the entire stirring device,which affords a very largearea of heating-surface, consists of four pieces only in addition to thecentral shaft. In my construction the broad sides of the scoops mayobviously be extended without making any increase of resistance exceptthe frictional contact with the increased sur face.

I am aware that broad stirrers with sharp forward edges have been formedwith perforated surfaces` to distribute air and water through a body ofmalt, but my construction differs in function from such stirrers byusing the extended surface for the conduction of heat and in rotating aportion of them close to the walls of the cylinder, where they could notact efficiently if perforated to distribute fluid into the material.

I do not claim the use of steam-heated stirrers, broadly, nor the mereuse of the stirrers with broad sides tapering from the forward edge, buthave described the construction and arrangement of my stirrers so thattheir specific character will be apparent.

Having thus set forth the nature of my invention, what I claim hereinisl. The combination, with the drying-cylinder A having the steam-jacketB about the same, and the central rotary shaft S provided at itsopposite ends with the steam-inlet pipe E and the outlet-pipe F, of theseries of hollowimperforate cast-iron scoops I carriedby the shaftlongitudinally of the cylinder and having a flattened wedge shape incross-section, as set forth, certain of the scoops being supported andmoved close to the shell of the cylinder to detach the materialtherefrom as it dries, and each of the scoops being formed in one piecewith two hollow cast-iron arms II secured to the shaft in connectionrespectively with the inlet and outlet pipes, as and for the purpose setforth.

2. The combination, with the drying-cylinder A having the steam-jacket Babout the same, and the central rotary shaft S provided at its oppositeends with the steam-inlet pipe E and the outlet-pipe F, and formed inone piece of cast-iron with the hollow square collars Gr, G', near itsopposite ends with passages J and K extended from the inlet and outletpipes respectively within such collars, of the four hollow cast-ironscoops formed each in one piece with the hollow arms II and feet I-I,the feet being bolted upon the square sides of the collars, and thewhole arranged and operated to secure a circulation of steam from and tothe collars through the arms and scoops, substantially as herein setforth.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

THOMAS S. CRANE.

Witnesses L. LEE, EDw. F. KINsEY.

